The animal nutrition industry is se

The animal nutrition industry is searching for more suitable
diet formulations and dietary supplements to provide better
animal nutrition at lower production costs. Most nutrients
required for normal metabolic functions are either not
endogenously synthesized or their synthesis is insufficient,
and therefore must be continuously supplied in the diets.
Standard feed supplements have been used over the years,
but they do not properly supply the requirements of many
nutrients when immune competence and not only animal
performance is considered (Karadas and Surai, 2004). Considering
essential nutrients, trace minerals (particularly selenium)
are critical to maintain poultry health and performance.

Selenium is essential for animals due to its roles as metabolism
regulator, adequate body development and reproductive
performance, and aiding the immune system to neu